Instant ink free 3 months not showing in my account

‎02-11-201902:14 PM

Hi today I bought a new HP Deskjet 2620 printer. I have set up my printer and have gone to hpinstantink.com to pick my plan (£1.99 a month). In my account is doesnt show that i will have my three months free which was advertised with the printer. Please can you help?